RE: Goldberg Skylark 56 ARF versus Tower Kaos 40 ARF
Perhaps the variance in Skylark reports is due to a generational thing, of sorts.
When I flew Skylarks, very late Sixties and early Seventies, we avoided rearward balance point positions for fear of an inadvertent snaproll on landing. Don't forget (you probably haven't) that radios cost the equivalent of a month's pay back then, unlike today.
By moving the balance point rearward, the hesitation to snaproll and spin are considerably reduced. Folks today run balance points much further rearward than we did when radios cost a fortune.
Ed Cregger